"Teach your employees that if you don’t want to be interrupted you better write good documentation."
And reward them for doing it.
If your company do "360 degree" evaluations where your peers praise you for your quick answers to their questions, you are effectively incentivised to NOT document and instead be interrupted...
One does not preclude the other. Your quick answers can come in form of sending them links to the relevant parts of the documentation you wrote earlier.
And if their question is not something that can be answered that way, you can improve your documentation so that next time the question is asked, you do not have that problem.
And reward them for doing it.
If your company do "360 degree" evaluations where your peers praise you for your quick answers to their questions, you are effectively incentivised to NOT document and instead be interrupted...